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INCOME TAXES - Additional Information (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |  |
Income tax expense (benefit) |  | $ 43.4 | $ (7.2) | $ 87.0 | $ 61.1 |
Income tax expense, percentage of pre-tax income |  | 12.90% | (2.50%) | 9.40% | 8.00% |
Effective tax rate |  | 21.00% | 35.00% |  |  |
Tax benefit from expiration of statutes of limitations |  | $ 4.6 | $ 14.9 | $ 4.6 | $ 14.9 |
Tax benefits from reevaluation of certain unrecognized tax benefits |  |  | $ 53.5 |  | $ 45.7 |
Provisional income tax expense |  |  |  |  |  | $ 317.8
Provisional estimate of minimum tax on foreign earnings |  | 12.6 |  | 28.1 |  |
Repatriated undistributed foreign earnings | $ 1,600.0 |  |  |  |  |
Repatriated cash, cash equivalents and investments | 1,400.0 |  |  |  |  |
Repatriated note | $ 200.0 |  |  |  |  |
Total gross unrecognized tax benefits |  | $ 73.7 |  | 73.7 |  | $ 65.4
Net increase (decrease) of unrecognized tax benefits |  |  |  | $ 8.3 |  |

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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